Fuzzing is a software security testing technique that automatically provides invalid and random input to an application to expose bugs, helping developers understand the behavior and vulnerability of applications more comprehensively. Fuzzing tools, referred to as fuzzers, are used to perform this kind of testing, which can stress an application to cause unexpected behavior, crashes, or resource leaks. This technique offers several benefits, including preventing zero-day exploits, identifying bugs that hackers can exploit, having a low overhead cost in time and money, and uncovering edge cases that manual testing would be unable to find. Fuzzing use cases include web application fuzzing, API fuzzing, URL fuzzing, protocol fuzzing, and file format fuzzing, each of which helps identify vulnerabilities in different aspects of an application's security posture. While fuzzing tools have limitations, such as not being effective at detecting threats that don't cause application crashes and requiring significant time to complete a testing exercise, they can be combined with other security tools, like Snyk vulnerability scanners, to provide comprehensive security for an application.